ASPEK REPRODUKSI BELANAK (Liza subviridis) DI ESTUARI OPAK KABUPATEN BANTUL

FADLY HASAN, Dr. Ir. Djumanto, M. Sc.

2013 | Skripsi | MANAJ. SUMBER DAYA PERIKANAN

Penelitian ini bertujuan untuk mengetahui aspek reproduksi belanak (Liza subviridis) di estuari Opak, Kabupaten Bantul. Pengumpulan sampel belanak diperoleh dari hasil tangkapan nelayan menggunakan jaring insang di seluruh area estuari Opak selama bulan Juli – Oktober 2012. Data yang dikumpulkan meliputi panjang total, berat, jenis kelamin, tingkat kematangan gonad (TKG) dan fekunditas. Analisis hasil pengamatan meliputi distribusi panjang dan berat, rasio kelamin, tingkat kematangan gonad, distribusi diameter telur, fekunditas, dan hubungan fekunditas dengan panjang total. Hasil penelitian menunjukkan panjang total belanak berkisar antara 7,2-35,9 cm dan berat 3-492 gram. Belanak jantan dan betina terdapat dalam komposisi seimbang dengan rasio 1,1:1. Belanak jantan dan betina berada pada lima tingkat kematangan gonad yang didominasi oleh TKG II ke bawah. Fekunditas belanak berkisar antara 22.310-178.446 butir. Hubungan fekunditas dengan panjang total berkorelasi positif mengikuti persamaaan F = 1,057 L 2,289 (R2=0,832). Diameter telur berdistribusi normal dengan dua puncak berkisar antara 0,11-0,35 mm dan 0,36-0,56 mm, yang menunjukkan bahwa belanak memijah secara parsial.

The purpose of this research was to know reproductive aspects of mullet inhabitat in Opak estuary, Bantul Regency. The fish samples were collected using gill net of various mesh size in entire of Opak estuary during July to October 2012. Data that were collected namely total length, body weigth, sex, gonade maturity level (GML), and fecundity. The data that were analyzed including distribution of length and weigth, sex ratio, gonade maturity level, distribution of eggs diameter, fecundity, and fecunditytotal length relationship. The result showed that total length ranged from 7.2 to 35.9 cm and weigth ranged from 3 to 492 gram. The male and female ratio was 1.1:1. There were five grades of gonade maturity level for male and female which was dominated by GML level I and II. Fecundity of female ranged from 22,310-178,446 eggs. Fecunditytotal length relationship was correlated positively according to the equation F = 1.057 L 2.289 (R2=0.832). Eggs diameter distributed normally which had two peaks in ranged from 0.11-0.35 mm and 0.36-0.56 mm and showed that the mullet spawned partially.

Kata Kunci : belanak, Liza subviridis, reproduksi, estuari Opak